Some of these include dry mechanical[4] and [10] or chemical [11] and [12] exfoliation; unrolling/unzipping of carbon nanotubes (CNTs) through a variety of ways such as electrochemical, chemical or physical methods [13]; CVD [14] and [15] or epitaxial growth [16]; arc discharge; the reduction of graphene oxide [17] and [18]; and many other organic synthetic methods. Widely used CVD methods are able to synthesize high-quality graphene on the catalytic surface, such as nickel or copper, in the presence of a carbon supply such as hydrocarbon gases [19]. In Fig. 1, Raman spectroscopy is used for analyzing the defects in the synthesized graphene, as well as the number of deposited graphene layers [20].